well there is 2 versions of Classic II main boards.

there is the 4 chip version…



and i am pretty confident that with (this)… i can do what parallel is talking about.  with the dougg3 programmer, and with this new simm he has made!



and this is not just (rev 1) Classic II excitement… this is LC-I and LC-II as well!!!   /performa variants

The only issue is the later version of classic II has different roms,  only 2,  longer ones.



so look to see what board you have.